Semiconductor Circuits, Inc. | Technical Reference Notes for Semiconductor Circuits' DC/DC converters

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Technical Reference Notes/ Test Procedures

Consult factory for *RoHS converter model availability and lead-time.

SC60B Series: *60 Watt, *1500Vdc I/O Isolation,*Open-frame, * 1/2 bricks, *Ultra Wide Input *UL 1950 Recognition (Pending)

SC60B14-250-48 (PDF)
(18-76Vdc input, 24.0Vdc/2.5A output)
SC60B18-330-48 (PDF)
(18-76Vdc input, 18.0Vdc/3.3A output)

SC125A Series: *125 Watt, *2800Vdc I/O Isolation,*Open-frame, * 1/2 bricks, *Wide Input *UL 1950 Recognition (Pending)

SC125A11-2500-48 (PDF)
(36-76V input, 5.0Vdc/25 A output)
SC125A17-3000-48 (PDF)
(36-76V input, 3.3Vdc/30 A output)

SC10N Series: *Non-isolated POL, *10 Amp SIP, *Single Outputs, *Remote shutdown, *300kHz Switching frequency.

SC10N1X2-33 (PDF)
(3.0-3.6Vdc input, 1.2Vdc output)

SC10N3X3-5V (PDF)
(4.5-5.5Vdc input, 3.3Vdc output)
SC10N3X3-12V (PDF)
(10.8-13.2Vdc input, 3.3Vdc output)
SC10N5X0-12V (PDF)
(10.8-13.2Vdc input, 5.0Vdc output)

SC15B Series: *15 Watts, * Quiet * Wide Input Range,*UL1950,cUL,EN60950.

SC15B12-125-46 (PDF)
(18-75Vdc input, 12Vdc output)
SC15B13-100-46 (PDF)
(18-75Vdc input, 15Vdc output)

SC20A Series: *20 Watts, * 4:1 Ultra Wide Input Range,*UL1950,cUL,EN60950.

SC20A11-400-18 (PDF)
(9-36Vdc input, 5Vdc output)
SC20A11-400-46 (PDF)
(18-75Vdc input, 5Vdc output)
SC20A12-167-46 (PDF)
(18-75Vdc input, 12Vdc output)
SC20A22-167-46 (PDF)
(18-75Vdc input, +/-12Vdc output)
SC20A23-134-46 (PDF)
(18-75Vdc input, +/-15Vdc output)

SC75A Series encapsulated 1/2 brick: *75 Watt *4:1 Ultra Wide Input Range (18-75Vdc), *Single output, *Fully isolated and I/O protected, *Industry standard footprint, *UL1950, *TUV.

SC75A11-1500-48 (PDF)
(5Vdc output @ 15.0A)
SC75A12-625-48 (PDF)
(12Vdc output @ 6.25A)

SC75A13-500-48 (PDF)

(15Vdc output @ 5.0A)

SC75A14-300-48 (PDF)

(24Vdc output @ 3.0A)

The product documentation listed above is in Adobe Portable Document Format (PDF). Adobe Acrobat Reader software, available free from the Adobe web site, is required to view, print, or save these pages. Click on the icon to go to the Adobe site to download the required software.

Test Procedures

Output Voltage Tolerance

Apply the nominal rated DC input to the converter under test.
While drawing the rated load current measure the output voltage of the converter under test.
The tolerance is the difference between the measured voltage (Vout) and the specified
output voltage (Vnom) expressed as a percentage of Vnom:(|Vout-Vnom|/Vnom)*100%.

Line Regulation

Apply the nominal rated DC input to the converter under test.
While drawing the rated load current measure the output voltage of the converter under test. (Vnom)
Apply the minimum rated DC input to the converter under test.
While drawing the rated load current measure the output voltage of the converter under test. (Vlow)
Apply the maximum rated DC input to the converter under test.
While drawing the rated load current measure the output voltage of the converter under test. (Vhigh)
Line regulation is the change in the output voltage as a result of the change in input voltage expressed as (|Vhigh-Vlow|/Vnom)*100%.

Load Regulation

Apply the nominal rated DC input to the converter under test.
While drawing the full rated load current measure the output voltage of the converter under test. (Vfull)
While drawing the minimum rated load current measure the output voltage of the converter under test. (Vmin)
Load regulation is the change in output voltage as a result of the change of output load current expressed as (|Vfull-Vmin|/Vfull)*100%

Ripple and Noise

Apply the nominal rated DC input to the converter under test.
Apply the full rated load current to the output of the converter under test.
To measure the True RMS value connect an AC coupled True RMS voltmeter to the output.
To measure the peak-peak value connect an ac coupled oscilloscope to the output.(be sure to properly
decouple the scope probe to insure an accurate measurement.)

Efficiency
- Calculate the input power (Pinput) to the converter expressed as Vin*Iin Measure the output voltage of the converter under test.
- Calculate the output power (Pout) being drawn from the converter under test expressed as Vout*Iout.
- Efficiency is ratio of output power to input power expressed as Pout/Pinput.
Semiconductor Circuits, Inc. 14C Industrial Way, Atkinson, New Hampshire, USA 03811

subsidiary of Cool Power Technologies

PHONE: 603-893-2330 FAX: 603-893-6280

This page last updated on May 25, 2007 this site: © Semiconductor Circuits, Inc.
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